Multiple-fuse plug



Nov. 27 1923.

I. H. TERRELL ET AL MULTIPLE FUSE PLUG Filed Jan. 5. 1.922

gwuenkozs Patented Nov. .27, 1923.

-ISALG n. zrnannm, AND name; 'rnaanLL, or KENT, omo.

uunrrrmsrusii PLUG.

- Application filed January},19322. seam. 527,213.

To all whom it may concern:

Be it known that we, ISAAC H. TERRELL and DANIEL L. .TERRELL, citizens of the United States of America, and residents of- "Kent, county of Portage and State of Ohio,

have invented certain new and useful Improvements in Multiple-Fuse Plugs, of

which the following is a specification,

This invention relates to fuse plugs, and it has for its object the provision of a plug which embodies a plurality of fuses arranged in such manner that they may be successively disposed between terminals for completing the electric circuit.

A further object is to provide a fuse plug of the multiple-fuse type in which the fuses are carried b a member which maybe readily rotate as occasion may require for i successively positioning the fuses, and

which, following exhaustion of the fuses,

may be easily removed, re-equipped with,

fuses and replaced by persons possessing little or no mechanical ability.

A still further object is to provide, in a' device of the character mentioned, a dial and indicator by which one is enabled to accurately position the various fuses for insuring proper electrical contact, and which also serve to visually indicate-at alltimes the number of unused fuses remaining in the phxi g. v

ith these and other important objects in view, theinvention resides in the features of construction, arrangement of parts and combinations of elements which will hereinafter be fully described, reference being had to the accompanying drawings, in which Figure 1 is a central longitudinal. section of the invention;

Figure 2 is an outer end elevation;

FigureB is a similar view of the casing or body of the plug with the cap and fuse ma azme removed;

igure 4 is a lower end elevation of the fuse magazine;

Figure 5- is an enlarged detail view in side elevation of the fixed terminal of the plu removed;

igure 6 is an enlarged plan view of the pointer or indicator; and

Figure 7 is a side elevation of a fragmentary portion of the magazine, showing a fuse and. insulating strip mounted therein.

Referring to said drawings, 1 indicates a hollow cylindrical casing which is open 58 at its outer end and which has a reduced inner end 1, the latter bein exteriorly threadedand having mounted t ereon a metallic shell 2 which constitutes went the terminals of the plug and which is adapted for assuming threaded engagement with a socket in the usual manner. Said casing 1 is formed of a suitable non-conducting material, preferably glass, and may have'an integral wall or web 1 extending transversely across it at or adjacent to the junction of the reduced end 1 with the larger diameter thereof. The interior of said re duced end 1 is filled with plaster of Paris or othersuitable cementitious material 3 and, when the wall or web 1 is omitted, the outer end of said filler 3 may form the bottom of the chamber 4 located within that portion of the casing having the greatest diameter.

An insulating tip 5 of porcelain or other appropriate material is fitted upon the inher end of the reduced end 1 and is held 8, said disk having a plurality of regularly spaced radial slits 9 provided in its circumferentialedge, the same being adapted for the reception of the outer end portions of -a plurality of fuses 10 which have their opposite end portions in like manner received by slits 11 provided in a disk 12 of fiber or other suitable non-conducting material which is suitably mounted upon the lower end of said sleeve 7. The opposite endsor terminals 10 of the vertically disposed fuses 10 are bent horizontally so as to overlie and seat upon the non-confronting faces of the disks 8 and 12 for frictionally maintaining the fuses against chance displacement.

Seated within the upper end of the sleeve 7 and preferably threaded into place to insure perfect contact with the sleeves and also to allow for adjustment is ametal stem 13 which has its lower end seated directly upon the upper end of the spindle 6.

A spring contact 14.- is suitably mounted at the inner end of the chamber 4 in posirearwardly directed terminals of the fuses as the magazine is rotated forward, said contact being suitably connected, as by a wire 15, to the shell terminal 2.

A cap 16 is threaded upon the outer end of the casing 1, and preferably interposed between said cap and the magazine is a disk or washer 17 which may he made of any suitable material. The outer face of said cap may constitute a dial, being provided with numbers or other appropriate indicia which, when said cap is properly ositioned, indicate the positions of the fuses m the underlying magazine. A'pointer or indicator 18 removably mounted in a fixed position on the stem 13 is rotatable over the dial with rotation of the magazine and, assuming that is initially positioned in register with the first of the numbers or other indicia carried by said dial, it will at all times visually indicate, or afford means for determining the number oil fuses used and unused borne by the magazine,

A linger button 19 is detachahly mounted upon the projecting outer end of the stem 13, the same affording convenient means whereby the magazine may be rotated for positioning the fuses.

When all fuses have been blown, or used up, the same may be replaced loy new fuses upon removal of the magazine. Such removal may be readily efi'ected by slipping the magazine out of the casing following detachment of the finger button 19, indicator 18, cap 16 and Washer 17, said parts being removed in the order named. An insulator strip 20 is preferably associated with each fuse 16, the same losing seated against a side of the fuse and having its ends also received in the slits 9 and 11. @hviously, said strips serve to shield unused fuses from injury when fuse is blown.

As will he manifest from description, the current for completing the electric circuit through the plug enters through the head terminal 6 of the spindle 6 and passes thence through said spindle, the sleeve '3', the metal disk 8, the luse 10 which then occupies seated relation to the the foregoing I spring contact 1 1, said spring contact, and the wire 15 to the shell terminal 2.

The construction described not only provides a plug which is practically indestructible in that it may berefilled or re-equipped with luseswhen and as often as such may be re uired, hut also a plug which is extremey simple and inexpensive to manufacture.

What is claimed is- 1. A multiple l'use plug comprising a nonconductive casing carrying a threaded shell terminal on its inner end, a spring contact located within said casing and connected electrically with said terminal, a spindle having a portion disposed axially within said casing, and having its outer end forming the other plug terminal, a magazine mounted for rotation on said spindle, and a plurality of fuses carried by said magazine and adapted through rotation of the latter to he successively positioned with an end in engagement with said spring contact, said magazine including a, current-conducting sleeve embracin said spindle, a disk of insulation material carried by the inner end oi said sleeve, and a current-conducting disl: carried by the opposite end of said sleeve, said disks having corresponding radial slits in which opposite end portions of said fuses are disposed, a cap-like closure for the outer end of said casing. and means projecting through said closure whereby said magazine may be rotated.

2. A rotatable magazine for multiple fuse plugs, comprising a central member, a metallic dish carried at one end of said member, a tihre disk carried at the opposite end oi said mernloer, said disks having spaced radial slits therein, and a plurality of fuses arranged between said disks and having their opposite end portions slidahle to and from positions in said slits.

ln testimony whereof we aflir our signa tures in presence of two witnesses.

llSAAC H. TEE-HELL. DANIEL L. TERRELL. ll itnesses "Brannon donnso'u, 

